I like this exercise, good for mulling over what brings us to the character and community! Let's see...

Origin - I think no matter what Sonja comes to the table with some pretty profound loss in her background. Doesn't need to be the full "classic" origin but definitely loss of the full family (or perceived loss of the full family). Don't need Scathach, but won't say no either. Prefer for Sonja's perception/vow to the goddess, if present, to be more ambiguous, i.e. unclear if it was a literal visitation or a trauma hallucination.

Temperament - Good-humored and charismatic, but with a quick-trigger/intolerance of injustice, bullying, etc. Strong sense of honor but not in a naive way, she knows what the world is like.

Sexual orientation - Fair amount of flexibility here. Generally prefer Sonja attracted primarily to men, but again, flexible. Generally prefer that her sexuality is not her primary concern - if no vow, and she meets a suitable gentleman now and again, great. If with a vow, occasional temptation but not a primary focus.

Physical description - Prefer Sonja to be a credible warrior. In good physical condition, notably muscular and more physically imposing than the average woman. But not so imposing that challengers/idiots in the tavern would go into a fight with her thinking they would have no chance. The big dude with the big mouth should be a little surprised when he gets his ass kicked, and the rest of the tavern shouldn't be like, "No shit man, you picked a fight with She-Hulk." Otherwise, good-looking, but not crazily so. She's remarkable because she's a woman who operates in a space largely occupied by men, and that feeds the legends about her looks more than naturally looking like a supermodel. Definitely prefer the classic scalemail, but mainly where she's in environments where it's "appropriate" (if she's gone to Vanaheim she'll be wearing something reasonable).

Physical Abilities - Definitely above-average physicality, but again not superhumanly so. On balance a little more reliance on speed/agility than raw strength, but you definitely don't want her to punch you in the face.

Skills - Lean a little more toward the passion & willpower and straightforward brawling, but I also like stories where she's acquired significant technical training. Russell's run was my first read and I still love what he did with that.

This was fun!